Gather a sturdy cardboard box or thick cardboard sheet
Cut two parallel rows of evenly spaced notches along the top edge
Make the notches about the same width and depth
Leave equal spacing between each notch
Reinforce the cardboard with tape if needed
Use the notches to hold the Rainbow Loom bands in place
Place a hook or peg at one end if desired for easier band handling
Keep the loom flat on a table while working
Adjust the notch spacing to match the band pattern you want to make